Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-06-13
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
20 pages, 9 figures, submitted
Scientific paper
We perform 3D hydrodynamical numerical simulations of the winds interaction process in the massive binary system Eta Carinae, and find the secondary star to accrete mass from the dense primary wind close to periastron passage. This accretion is thought to result in the spectroscopic event and X-ray minimum observed in the system every revolution. We included the gravity of the secondary star and the orbital motion starting 19 days (90 degrees) before periastron passage. The accretion process is triggered by dense clumps that cannot be decelerated by the ram pressure of the secondary wind. The dense clumps are formed by instabilities in the thin dense shell formed by the shocked primary wind gas. We explore the role of the numerical viscosity and some physical parameters on the initiation of the accretion process, and explain the unique properties of Eta Carinae that allow for the periastron accretion process to occur. The accretion starts about a week before periastron passage, as is required to explain the several weeks long X-ray minimum.
Akashi Muhammad
Kashi Amit
Soker Noam
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